Gear train arrangement in the driving mechanism of weaving looms



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GEAR TRAIN ARRANGEMENT IN THE DRIVING MECHANISM OF WEAVING LOOMS FiledSept. 27, 1951 5 Sheets-Sheet 2 TIDE/Vi)";

United States Patent GEAR TRAIN ARRANGEMENT IN THE DRIVING MECHANISM OFWEAVING LOOMS Jaime Picanol, Zandberg, Zillebeke-lez-Ypres, BelgiumApplication September 27, 1951, Serial No. 248,615 2 Claims. (Cl. 139-1)The present invention relates to weaving looms and, more particularly,to the gearing used in the driving means of said looms.

In modern weaving looms the driving arrangement for the picker shaft issuch that, at each revolution of the crank shaft, the driving mechanismof the loom and, more specifically the gearing thereof, is strongly andunequally stressed. This is due to the fact that the picker shaft driveoperates periodically at a constant rythm, whereby the gear train isalways stressed at certain specific points thereof. Examination of saidpoints will show that, in due time, a few teeth only of the gears weardown, to a dangerously high value, whereas the remaining teeth of thegears are perfectly sound. For obviating this difliculty, it is theusual practice of displacing periodically the gears on their shaft so asto change the meshing relation therebetween. Unfortunately, however, thecurrent weaving looms do not embody the means to effectuate thisoperation easily so that said loom has to be dismantled, almost, wherebymany parts have to be removed and replaced with consequent long periodsduring which the loom is idle. As a matter of fact, it is sometimesconsidered more advantageous to let the gears wear down completely,after which they are simply replaced with new ones. Of course, thisreplacement necessitates the shutting down of the loom and, furthermore,gears have to be scrapped on which only a few teeth are worn down, therest of the teeth being perfectly serviceable.

The present invention has been conceived to avoid the disadvantagesnoted above and to provide convenient rapid and economical means for theperiodic shifting of the relative position between the gears of the loomdrive.

According to the invention the gears are constituted by a toothed rimproper having a hub and, between said rim and said hub mutual securingmeans in angular positions relatively variable, either progressively oraccording to predetermined conditions. In a simple and economicalembodiment, the hub carries at least one flange, provided with a certainnumber of apertures, the

toothed rim having corresponding apertures adapted to register withthose of the hub and in apertures suitable securing means can beinserted. Thus, it is possible to displace angularly the rim withrespect to the hub and to secure both mutually in any desired angularposition. It is only necessary that the said securing means be easilyaccessible and comfortably operable to simplify, even accelerate, theoperation of which registered changing the relative angular position ofthe gears in the loom drive and, consequently, to change periodicallythe position of the teeth receiving the greatest stresses from theoperation of the picking mechanism.

The object of the invention, therefore, resides in the provision ofimproved means for efficiently, simply and economically effecting theuniform distribution of wear in the gear trains of a weaving loomdriving device.

As an example, and for purposes of illustration, an embodiment of theinvention is shown in the annexed drawings wherein:

Figure 1 is a lateral elevation view of the driving mechanism of aweaving loom,

Figure 2 is an enlarged view of the gears interposed between the drivingshaft and the picking shaft, and

Figure 3 is a section taken on line III-III of Figure 1.

Referring to the drawings, wherein similar reference charactersrepresent corresponding parts throughout, the

main driving shaft of the motor 1 carries a pinion 2 meshing with thegear rim 3 mounted on the crank shaft This gear rim 3 is secured to ahub 5 keyed on said crank shaft 4. For that purpose, the hub carries anannular flange 6 formed marginally with a series of equally spacedapertures 7 (in the present instant in the number of 12) whereas thegear .rim 3 has only three apertures, which apertures receive securingbolts 8 extending also through the corresponding apertures of the hub 6.Obviously, with this arrangement, it is possible Itlo bdisplaceangularly the gear rim with respect to the A second gear rim 9 isconcentrically superposed upon the gear rim 3 by means of securing bolts10. Consequently, it is possible also to displace angularly the two gearrims 3 and 9 with respect to each other.

The gear rim 9 meshes with a gear rim 11 which is secured to the pickingshaft 16 carrying the cam 15 of the picking mechanism. For that purpose,a sleeve 12 is keyed on the picking shaft 16 and the said sleeve carriesa flange 13 which is apertured in correspondence with the gear rim 11,so that said registering apertures be engaged for securing together thegear rim 11 to the flange 13 by means of bolts 14. With thisarrangement, also, it is possible to vary the relative angular positionbetween gear rim 11 and the sleeve 12.

From the foregoing, it should be clear that the present invention is anadvance in the art of loom driving mechanism since, due to theparticular arrangement of the gears noted above, it will be possible, bythe simple expedient of removing and displacing ordinary bolts, tomodify without trouble, rapidly and economically the relative angularposition of various gear rims with respect to their supporting hub,whereby the periodic stresses will be carried by fresh teeth of the geartrain so as to prolong considerably the useful life of the gears untilall teeth thereof are equally worn.

Obviously, the operation above can be eifected periodically or at anytime found opportune, the said angular displacement depending evidentlyupon the stresses imparted to the gears and, specifically, of the numberof places stressed strongly for each revolution of the gears considered.

Naturally, the number of apertures and bolts required will vary and mustbe determined for each specific application. It should be possible alsoto guide properly the toothed rim upon its hub and to interpose betweenhub and rim, means adapted to rotate said rim on said hub and to fixedlysecure both together, under conditions such that the variation of therelative angular position therebetween be produced progressively.

It must be understood that various changes as to the shape, size andarrangement of parts can be resorted to without departing from thespirit of the invention or the scope of the subjoined claims.

What I claim is:

1. As an improvement in the driving gearing of a weaving loom having adriving pinion, a crank shaft and a picking shaft, a first gear mountedon the crank shaft, and comprising a hub keyed to said crank shaft andhaving an outwardly extending annular flange provided with a pluralityof spaced concentric marginal apertures, a toothed rim having a rabbetedannular flange engaging the outer edge of said hub flange, said rabbetedflange having apertures to register with said hub flange apertures, afirst series of securing bolts adapted to be passed through theregistering apertures for clamping the hub and the toothed rim together,a second toothed rim having an annular flange surrounding the hub flangeand abutting the annular rabbeted flange of said first named toothedrim, a second series of securing bolts passing through registeringapertures in the annular flanges of said first and second toothed rimsto removably secure said rims together, and a second gear keyed to saidpicking shaft and meshing with said second toothed rim, so constructedand arranged that said toothed rims can be angularly displaced relativeto each other and to the hub 2. In the driving gearing of a weaving loomas claimed in claim 1, whereas said second gear also consists of a hubkeyed to said picking shaft, of a toothed rim hav- 3 ing apertures toregister with marginal apertures made in said last named hub, and of athird series of securing bolts to removably secure said last namedtoothed rim to said last named hub by passing through the registeredapertures of the same. 5

References Cited in the file of this patent UNITED STATES PATENTS781,219 Mills Ian. 31, 1905 10 4 Mathewson Apr. 23, 1907 Wall Oct. 1,1912 Gossett Mar. 30, 1926 Hathaway -2 Oct. 4, 1927 Compton Mar. 3, 1931Miller et a1 Aug. 21, 1934 FOREIGN PATENTS Great Britain of 1883 GreatBritain of 1894

